The candy was manufactured by Kanro, one of Japan's major candy companies, and test marketed in some stores last fall by Lawson, a convenience store chain. It appeared again for a few weeks this summer in most of the company's 14,600 stores. Seven pieces cost the equivalent of $1.31, including tax. They came in a simple silver package decorated with a bird-shaped character. The candy was developed for people who wanted to moisten mouths that had gone dry from all-day mask-wearing but without a sugar rush, said Osamu Oouchi, 42, a member of Lawson's product development team.